@ahmadyousif since you've already replaced the battery and the charging board, there are only a few possibilities left. First make sure that all of the flex cables are properly connected and that there is no corrosion or bend pins in the connectors. Check the flex cable that connects from the charging board to the main board. Check for tears, punctures and corrosion. If all of that checks out, you want to follow the Samsung Flowchart for the No charging Situation. Check the capacitors with a multimeter to ensure you have the proper voltages and if you don't you may need to reflow or replace the IC's as listed.
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